When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
The furthest one into the hole is the actual nap ring groove. Once I got it over the first step-down groove with the snap ring pliers, I used a 10mm socket to push until it snapped in place. Where's your spring?